23791

Appears in sequences

• Number of stereoisomers of acyclic hydrocarbons with n carbon atoms.at n=9A036672
• a(1)=1, a(n)=2*a(n-1)+1 if that number is composite, a(n)=a(n-1)+1 otherwise.at n=21A081871
• The least number s having exactly n threes in the continued fraction of sqrt(s).at n=19A206583
• Number of (w,x,y,z) with all terms in {0,...,n} and (least gapsize)<2.at n=14A212896
• Bases with a record -- new or tie -- smallest 'stem value' for which a prime by concatenation of decrements exists.at n=26A220402
• Semiprimes generated by the polynomial 2 * n^2 + 29.at n=27A241554
• Triangle T(n,f): the number of signed cubic graphs on 2n vertices with f edges of the first sign.at n=54A321305
• Triangle T(n,f): the number of signed cubic graphs on 2n vertices with f edges of the first sign.at n=66A321305
• Composite numbers of the form 2*k^2 + 29.at n=27A352949
• Number of integer partitions of n whose parts do not have weakly decreasing numbers of prime factors (A001222).at n=41A358910